Car-door-operating mechanism



Mai-ch 19, 1929;

- A. a. ZIMMER CAR D001; OPERATING MECHANISM Filed Sept.. 1927 3 Sheets-Sheet March 19, .1929.

A. E. ZIMMER cm noon OPERATING uscmxsu Filed Sept. 8. 1927 3 Sheets-Sheet 3 19, 1929. A} E. ZIMMER I CAR DOOR OPERATING IECHANISI Filed Sept. 8. 1927 a Sheets-Sheet 3 T Z/MMER improved shaft rotating means of simple Patented Mar. 19, 1929.

UNITED STATESFPFATIENFT 7-OFF=I-CE.

ALBERT E. zIMMER, OF CHICAGO, 'L INoI's, ASSIGNOR- TO. ENTERPRISE RAILWAY v EQUIPMENT COMPANY, QECHICAGO, ILLINOIS, A CORPORATION or ILLINOIS.-

CAR-DOOR-OPERATIN G MECHANISM.

Application filed September My invention relatesto improvements in car door operating mechanisms.

My invention relates more particularly t door operating mechanisms of the type having shafts with self-locking winding mechanisms adapted to support the doors in closed position, without subjecting the shafts to torsionaland twisting strains whenthe doors are in closed and locked position.

An object of my invention is to'provide an form whereby a wii'iding mechanism of the character described may be operated with perfect safety to the operator.

Another object of my invention is to provide a door operating mechanism in which a shaft will operate to support a door in fully closed position throughout a partial revolution of the shaft without imparting any torsional strain to the said shaft thereby com-- pensating for variations in manufacture, wear, or twisting of the sh-aftduring opera tion of the doors. I

Still another object of my invention is to generally improve the construction of door mechanisms of the type having bodily displace-able operating shafts.

Other objects of my invention wi-llmore clearly appear from the detailed description hereinafter following.

For further comprehension of my invention reference must be had to the accompanying drawings wherein Fig. 1 is a plan view of a portion of a gondola car having my improved door mechanism embodied therein, parts being broken away to illustrate certain details. Fig. 2 is a longitudinal sectional view taken through a portion of the caron a line corresponding substantially to line 22 of Fig. 1. 4 verse sectional view through the car and showing approximately one-half the width of the car, said view being takenon a line corresponding substantially to line 33 ofFig. 1. Fig.4: is an enlarged detail view of the door mechanismshown in Fig. 3. Fig. 5 is a View similar to Fig. 3 but showing the door in open position. Fig. 6 is a fractional elev vational view of a portion of the ear adjacent the end thereof illustrating the shaft locking and retaining mechanism and the shaft ro- Fig-. 8 is a vertical trans- 8,1927. Serial No. 218,237.

tating means. Fig. 7, is an elevational view of that portion of the car shown in Fig. 6, same being shown as'viewed from right to left; and Fig. 8 is a vertical sectional View of a portion'of the endofthe car and taken on a line corresponding substantially to line .88 of Fig. 6. 1

In said drawings, I have shown my invention as applied to a drop bottom door cariof a form well known in the art, cars of said type generally having a plurality of doors on each side of thecen tersi1l the number of which may be .varied asdesiredr Said doors are generally operated from the ends of the car in sets of several doors each. In my drawings I have only considered itneeessary to indicate and describe one of such doors on one side of the :eenter sill, as it vis evident that the embodiment the same whether employed on one side or ?both sides of thecenter sill, or with one or more'doors.

The car, as shown, is provided with a centre sill ind-icatedat 10, cross-beams 11, crossbeam top cover plates 12, side stakes 13,0211 side bottom chord 1 1 and car side wall 15. The floor of theear, or such port-ion of it as desired, isformed by floor doors generally indicated by the reference characterA, the latter being pivotally attached along its inner edge as indicated at 1 6, to suitably hinge butts 17, which in turn are secured to the center sill '10. p The cross-beam top cover plates 12, along each side edge of the door, and the car side bottom chord 14 are each preferably extended to overlap the side door A to provide an overhanging abutment for the sides andfree edge of'thedoorwhen"in-closed posierally be one door A between each pair of cross-members of theunderframeoneach side of the center sill.

Each door A. is preferably reinforced with depending flanges along its rear, side and front edges, as indicated at 18, 19 and 20, re-

' tion. As will be understood, there will gensame and bring it to a closed position, are flexible connections B, each having one end attached to the door and the opposite end to a longitudinally operating shaft In carrying out my invention, the cross-beams 11 of the underframe are apertured at their outer ends so as to accommodate the longitudinally extending operating shaft 23, which extends through the said apertures, there being a bearing casting extends, said casting being riveted or otherwise suitably secured to the cross-members and formed with elongated openings through which the shaft extends. On each door ii, preferably near each end thereof, and in alignment with the flexible connections B, a bracket is riveted hereto inwardly of the free cc go of the door to the door plate as indicated at 25,and to the vertical flange of the transverse beam 21, as indicated at 26, said bracket 24 being extended outwardly beyond the flange 20 of the door, the latter being cut away as indicated at 27-27 to accommodate the bracket. inwardly of the door flange the bracket is formed with walls 28*28 which extend outwardly from the respective sides of the bracket and are secured to the door flange on each side of the cut-away portion by rivets 29, thereby providing continuity of reinforcement for flange 20 across the plane of the bracket 2e, and the effect of a continuous door beam is therefore maintained throughout the length of the door. Outwardly of the flange 20 the bracket 24: is formed with a plurality of arms 30-3O spaced from each other and formed with a flat nearing portion on their underside as indicated at 31 for the purpose to be hereinafter described, each said arm 30 being also bracedlaterally to the adj acent wall. 28 by a lateral integral wall portion 32 which extends beneath the flange 30 of the door.

A link 33 is pivotally attached to the arms 30 by pivot 34-, Said link is adapted to lie be ween the spaced arms 30 and is formed on its underside with a flat seating portion adapted to align with seats 31 on the arms 33 of bracket 24%., when the door is in closed po sition. To the outer end of the link is pivotally connected at 133, a link 36 and the latter in turn is pivotally connected as indicated at 37 to a pair of links 38. Pivotally attached to the opposite end of the pair of links 38 is a link 39 which in turn is pivotally connected at 40 to arms lab-1 11 formed integrally with a hub casting 41 fixedly mounted on the shaft 23. Said hub casting 41 is formed on its upper face as viewed when the parts are. in position, shown in Figs. 3 and a with the shaft beneath the door, with a flat surface 42 on which the Hat surfaces 31 and 35, respectively, of the bracket and link 33 are adapted to bear.

Assuming the parts to be positioned as in Figs. 3 and 4, with the door in closed posi- O, through which the shaft ti on and the shaft in locked position beneath the door, a vertical line passing through the axis of the shaft 23 is slightly beyond and to one side of a vertical line passing through the pivotal connection 34 between the link 33 and V bracket 24 thereby transmitting the weight of the load dir ctly to the shaft and rehev ing the pivotal connect ons of the weight of the door and also relieving the shaft of all torsional strains, the'thrust of the load being then directly communicated from the door to the shaft on the vertical line 13 which,v it will be noted, passes approximately midway of the flat bearing surfaces 31, 35 and lhe hub casting 1-1 is formed with hearing faces i2, 45, 4.6 and 17, on which the links 33, 3 33 and 39 are respectively adapted to lie when the door is in closed position, the link 33 then sloping downwardly and outwardly from the free edge of the door thereby providing a com paratively short lever arm between the tlXlS of the shaft and the pivot 133, thus facilitating the movement of the shaftto a position beneath the door. The link 33 is provided with lugs 4-8 outstanding from the sides thereof and adapted to co-operate with upstanding lugs on the hub casting 11 whereby said link and hub casting are locked relatively each other.

The bearing castings C, which are riveted or otherwise suitably secured to the crossmembers, are provided with the elongated openings 51 in which the shaft 23 is adapted to have bodily movement, and said elongated openings 51 are provided with flanges 52 so as to provide a wider bearing for the shaft 23. The contour of the lower face of the bearing is formed of two depressed portions of arcuate shape as indicated respectively at 53 and 54, said curves being separated by an inter vening raised portion 55 preferably of re versed curved formation. The curved hear ing 53 is formed on radius 56, having its center substantially coinciding with. the pivotcd center 34: as l cated when the door is in fully closed position thereby providing an arc concentric to the path of movement of the shaft whereby the latter will have a limited movement in the slots beneath the door with out affecting the movement of the door, it being understood that by reason of the locking action brought about by inter-engagement of lugs 48 of link 33 with lugs 50 of hub casting 41, said link 33 and hub 41 move as a unitary structure beneath the door, the entire mechanism pivoting about pivot 34. Curved bearing 5/1- is dispose" at the outer end of the elongated bearin and is formed on a curve of slightly longer radius than that of the shaft for the purpose of receiving the shaft and permitting free rotation thereof when it is beyond the free edge of the door.

Assuming the parts as shown in Figs. 3 and 4, and it is desired to open the door, the operation is as follows: The shaft 23 will be rotated in aclock-wise direction preferably by rotating means as hereinafter describedand the shaft and the mechanism will pivot about pivot 34 thereby moving the shaft outwardly along the curved bearing 53. This bodily movement of the shaft will continue until the shaft passes the raised portion when the shaft will be forced outwardly by the movement of the door, into depressed portion 54; where it will rotate freely as t he weight of the door extends, the links and causes the shaft to rotate in an unwinding direction, the door and mechanism finally assuming the position indicated in Fig. 5. The closing operation of the door is the reverse to that described for the opening movement, the shaft being rotated in an anti-clock wise direction and retained in the curved bearing 54- by reason of the direction of rotation of the shaft and also by the-curved raised portion 55, until such time as the door is almost fully closed, when the shaft will be drawn inwardly beneath the door, pivoting around pivot 34:.

The shaft 23 is preferably extended to the end of the car and end sill 57 where the end of the shaft is provided with locking means as indicated at D and rotating means as shown at E. The purpose of the locking means D is to prevent the shaft from rotating in a reverse direction, during either the closing of the door or after the doors have been placed in closed position. Said lockingmeans D includes a ratchet wheel 58 secured to the shaft, a creeper 59 loosely mounted on the shaft adjacent the ratchet wheel, a pawl 60 mounted on the creeper'and a cam 61 adapted to lock the pawl 60 relatively to the ratchet. Said pawl 60 and cam 61 are mounted on lugs 62 preferably formed integrally with an outstanding arm 63 on the creeper. The tie plate 64 overlies both the cam and the pawl and further serves to retain these members in fixed relation to each other. Opposite to arm 63 there is an inwardly extending arm 65 with whicha bracket 66 carried by the car structure is adapted to cooperate to prevent turningmovement of the creeper relatively to the axis of the shaft. The disposition of the pawl and cam above the ratchet wheel and outwardly of the shaft facilitates the manipulation of the pawl and cam and provides for safety and convenience in operation.

The shaft rotating means E includes a member fixed relatively to the end of the shaft and formed with a disc-like body por, tion 67 spaced longitudinally of the shaft from the ratchet locking mechanism D, said body portion 67 having outstanding portions 68 on each side thereof and a square hub 69, the latter presenting flat outer walls 169. Projections 68, which extend outwardly from the corners of the square hub, provide means whereby a removable bar may be inserted to rotatethe shaft, said projection being disposed in the plane of rotation of the shaft but substantially at right angles to each other and formed with concave and convex surfaces as indicated at 70 and 71 respectively.

Each side projection 68 is formed as follows: Intermediate the axis of the shaft and the convex surface 71 there is disposed a Substantially flat wall 72 which extends at an an gle to the plane of the adjacent wall 169 and connects with the said convex surface 71 with a comparatively sharp curve 7 3. The opposite or concave surface 72 of the projection connects with the adjacent hub wall 169 by a curve 74of comparatively small radius and adjacent the opposite end of the concave surface there is formed a short flat wall 75 which is preferably disposedsubstantially parallel to the said fiat wall 7 2. There are preferably four projections 68 on each side of the disc arranged around the axis of the shaft in the form of a whorl, the projections on therespective sides of the disc being formed in the same manner but facing in opposite directions, the outer and inner sets of projections being respectively used in lowering and in raising the doors in the-manner hereinbefore described, The arrangement of flat walls 72 and 75 in combination with wall 169 provides a socket like recess whereby a removable bar, such as indicated at 76 or 77, may be inserted and gripped between these wall sections and by applying pressure on the bar in one direction it will be clamped between said walls and cause the bar and the body portion 67 to move in unison but, on reversing the direction of pressure on the bar, the latter will be automatically disengaged by rolling on the convex surface of said socket-like portions, and the concave surface of theopposite wall will then guide the end of the bar beyond the periphery of the disc 67. r

The operation is as follows: Assuming the parts to be positioned as in Fig. 7, with the door in locked position, the operator first disengagcs the mechanism E, then inserts the bar 76 is indicated in Fig-.17. on the outer side of the disc with the bar bearing against the flat walls 72and 75v and, by rotating the bar in a clockwise direction as indicated at 78, the bar is gripped between said walls and the shaft and bar then rotate in unison until such time as the door mechanism. is unlocked when the shaft will be displaced from supporting position beneath thedoor and thereafter rotate in the same or clockwise direction with great speed under the load thereon, this being commonly known as over-running. Due to the fact that the concave surface 7 0 will move away from the bar and the convexsurface 71 will move the bar outwardly, disengagement between the bar and the disc will be automatically effected when the shaft over- To raise the doors, the operator reverses the operation inserting the bar 77 in the projections on the inner side of the disc and, by pressing down on thebar, asindicated by the arrow 7 9, rotates the shaft a partial revolution. The pawl then will hold the shaft by means of the ratchet wheel and catch it in whatever position it may have been adjusted while the operator inserts the bar in the next succeeding pair of projections. These operations are repeated until the doors have been fully closed and the shaft moved to a supporting position beneath the door when the operator will throw the cam into locking position as shown in Fig. 8. It will thus be understood that no possible injury can result to the operator as even if he should, when lowering the doors, unwittingly or inadvertently insert his bar on the inner sideof the disc instead of the outer side thereof, the form and direction of the projections will preclude the attainment of a rigid connection between the bar and the projections, and the operator cannot release the door, but will be compelled to use the bar on the opposite side of the disc in the proper manner.

What I claim is:

1. In a mechanism of the character described, the combination with a car body having a floor body pivotally mounted adjacent its inner edge; of a longitudinally extending shaft; elongated bearings for said shaft adapting the latter for bodily movement inwardly and outwardly with respect to the free edge of the door; a shouldered hub carried by said shaft; a flexible connection between said hub and door comprising a plurality of links, one end link being pivotally at tached to the hub and the other pivotally attached to the door, the latter and the hub hav ing co-operating opposed shoulders whereby the end link and the hub are located in relative positions, the point of pivotal connection between the end link and the door forming the point of rotation from which the shaft is adapted to swing beneath the door; and a bearing face in the elongated bearing adapted to conform substantially to the arcuate path of movement of the shaft.

In a mechanism of the character described, the combination with a member having an opening therein and provided with a door for closing said opening; of an operating shaft for said door carried by said member and bodily movably mounted with respect to the door; a flat seat on the shaft; a connection between the shaft and the door; and a bracket extending outwardly beyond the door and there formed with a fiat seat adapted to register with the flat seat on the shaft.

3. In a mechanism of the character described, the combination with a member having a door opening therein and provided with a door for closing said opening; of an operating shaft for said door carried by said memher and movably mounted with respect to the door; a bracket projecting outwardly beyond the free edge of the door; a hub fixedly mounted upon the shaft, said hub being provided witha fiat bearing seat; a flexible connection comprised of a plurality of links interposed between said hub and said bracket on the door, said flexible co, nection including an end link pivotally attached the bracket, said end link and the bracket being provided with a flat' bearing portion adapted to regis r with the flat seat on the hub when the door is in closed position.

l. In a mechanism of the character described, the combination with a member having a dooropening therein and provided with a door for closlng said openin said door having a marginal reinforced ll: e extend ing adjacent the free edge thcrer a bracket extending through the said flange, said bracket including spaced walls and connections between the door flange at each side of the walls whereby continuity of the flange maintained across the plane of the said bracket; and a flexible connection consisting of a plurality of links interposed between said shaft and the bracket, said connectionin eluding an end link extending between the spaced Walls.

5. In a mechanism of the character described, the combination with a member having a door opening therein and'proyided with a door for closing said opening, said door having a marginal flange extending adjacent the free edge thereof; a bracket secured to the door; a flexible connection between the shaft and the bracket, said flexible connection including'an end link connected to the bracket, said bracket having its point of connection with the end link beyond the free edge of the door and. secured to the door inwardly of the flange, said flange being cut away to accon'imodate the passage of the bracket therethrough; and connections between said flange and the respective sides of the bracket. I

6. In a mechanism of the character described, the combination with a member having a door opening therein and provided'with a door for closing said opening, said door having a marginal reinforcing flange. adjacent the free edge thereof; of an operating shaft for said door carried by said member and movably mounted with respect to the door; a hub fixedly mounted on the shaft, said hub having a flat seat formed thereon adapted to form a bearing for the door when the latter is in closed position; a bracket extending through the marginal flange on the door, said bracket extending outwardly beyond the said andformed with a flat seat adapted to register with the seat on the hub;

and flexible connections between the hub and the bracket.

7. In -a mechanism of the character de scribed, the combination with a member having an opening therein and provided with a door for closing said opening; of an ope 7M.- ing shaft for said door carried by said memher and movably mounted .with respect to the interposed between said-hub and said edge of the door; and a'bracket extending out i 'wardly beyond the door and there formed with a flatseat, said shaft being movable to a position beneath the bracket whereby the flat seat on the hub will seat beneath the flat seat on the bracket. 8. In a door operatlng mechanism, the combination with an operating shaft; of a mem ber fixed'relativel thereto and havin ro- 7 w a a: ectlons for the purpose of retamlng are-,

movable bar whereby rotation of the shaft may be effected in one direction, said projections being so arranged that, upon over running of the shaft, the bar will be thrown clear of the projections. v a

i 9. In a-railway car-,the combination of an operating shaft adapted to be rotated; and a unitary element fixedly mounted onthe end of the shaft, said element. being adapted to receive and retain a removable bar when rotated in one direction and so shaped as to releasev the bar when the shaft rotates 1n the same direction at .agreater speed than that of actuation by the bar. I

10. In a railway car, the combination with an operating shaft adapted to be rotated; of an element fixedly mounted on the end of the shaft, said element including a diskand a plurality of projections extending outwardly from said disk, each said projection including on one side aconvex face and a flat section and'on theopposite side a concave face and a flat portion whereby a removablebar may be retained between the flat portions to rotate the shaft in one directionand will slide freely overq-the convex portion of one of said projections to permit the element to rotate free of the bar.

11. In a railway car, a shaft rotating means including a'fixed member having spaced, substantially.parallel wall portions adapted'to receive and retain a removable operating tool whereby rotation of the shaft may be effected in one direction,'said wall portions,

being adapted toengagc with the bar at different distances from the axis of the rotation of the shaft; and means associated with said spaced wall portions whereby gripping en gagement between the removable bar and the element is prevented when the bar is actuated in the opposite direction, said last named means including a convex wall associated with one of said wall portions and a concave wall associated with the other of said wall portions whereby the bar is adapted to rock on said.

convex wall and the end of the bar guided off in its rocking movement'by the concave.

wall, V,

12. In a railway car a shaft rotating means, including afixed element adapted to rotate with the shaft, said fixed element having two spaced walls adapted to'receive and grip a removable operating bar, one of said walls being-adapted to engage the bar: ad'- jZ cent-theend thereof, andthe other ofsaid wallsbeing adapted to engage the bar, at a greater distance from the axis of the shaft "thanthe first named wall, the shorter of said- :of rotation of the shaft in one direction; and

means associated with the shorter of said arms to move the bar away from theaxis of. he shaft whenthe bar is moved in theopposite direction. I s I 14. In a railway caiuthe combination with an operating. shaft adapted to be rotated; of a fixed element mounted on said shaft,'said element including aplurality of sets of 'abutments, each said set of abutments including an abutment located adjacent the axis of. the shaft and another spaced outwardly from the axis beyond the first named abutment whereby a removable bar will be, gripped between the respective abutments when the bar is actuated in one direction; and means associated with said abut-merits for disengaging the bar and moving the same clear of thefixed element when the bar. is actuated in the opposite direction. V a

15. In a railway car, thecombination with an operating shaft adapted tov be rotated of affixedelement mounted on saidshaft, said element including a recess having spaced walls, one ofsaid walls extending outwardly from thejaxis the shaft beyond; the other, the shorter of said-walls being adapted to form an abutment for the end of a removable 1 baran d the longer of said walls being adapted tQ-engage the s'aidremovable bar at a greater distance. from "its endthan the first named wall whereby a gripping action will be maintained between said removable bar andflthe walls when the shaft is rotated in one direction; and means for throwing the removable bar clear of the fixed element when the shaft moves'in said direction at-a greater speed than thebar.

16. In a railwaycar door operating mechanism, the combination with an operating shaft; of meansfor impartinga movement of rotation to said shaft, said means. comprising an element rigid with said shafnsaid element having a; lever Y receiving socket formed integrally therewith. said socket having a plurality of spaced abutments, one of said abutments extending beyond the other, the shorter of said abutments beings adapted to receive the end of a removable bar and the longenof said abutment-s being adapted to engage with the bar at'an appreciable distance from its engaging end whereby a gripping action will be maintained between said bar and the socket when the shaft is rotated in one direction and the bar will slidefreely off of the shorter of said abutments when the shaft over-runs in,

said direction.

17. In a car door operating mechanism, the combination with an operating shaft adapted to be rotated; of a member fixedly mounted on the shaft, said memberincluding a disclike member; outstanding projections on each side of said disc, said projections being arranged to present a whorl-like effect and spaced to permit of a bar being inserted be tween said projections to effect rotation of the shaft in one direction and wherebv the bar will be thrown clear of the projections when the bar is actuated in the opposite direction, one set of projections on one side of the disc extendingin one direction and the projections on the opposite side of the disc extending in the opposite directionwhereby theprojections on one side of the disc are necessarily engaged for rotation of the shaft in one direction and the projections on the other side of the disc are necessarily engaged for ro tation of the shaft in the opposite direction.

18. In a mechanism of the character described, the combination with a member having a door opening therein and provided with a door for closing said opening; of an operating shaft for said door carried by said memher and movably mounted with respect to one edge of said door; a flexible connection between said shaft and said edge of the door, said connection including an end link pivotally attached to a rigid part of the door; and co-operating means on said link and shaft arranged to force the shaft away from the said edge of the door when the shaft is rotated in an unwinding direction, said means comprising a shoulder on the shaft and a co-operating shoulder on said link, said cooperating shoulder on the shaft being disposed at the side of the link when the door is in closed position.

19. In a mechanism of the charctcr described, the combination with a member having a door opening therein and provided with a door for closing said opening; of an operating shaft for said door carried by said. member and movably mounted with respect to one edge of said door; a flexible connection between said shaft and said edge of the door and including an end link pivotally attached to a rigid part of the door; and co-operating means on said link and shaft arranged to force the shaft away from the said edge of aces the door when the shaft is rotated in an unwinding direction, said means comprising shoulders on the shaft and co-operating shoulders on said link, said means including a projection extending outwardly from the side of the end link and adapted to engage with a'lug on the shaft.

20. In a railway car the ratchet wheel and adaptedto engage the i same to lock the shaft against reverse rotation; and means acting upon one end of the arm to prevent turning movementof the creeper. I

21. In a car door operating mechanism, the combination with a rotating and bodily movable shaft; of a ratchet wheel fixedly mounted upon the shaft; a creeper mounted upon the shaft, creeper having arms extending outwardly from the opposite sides of the shaft; means acting on one of said arms to maintain the creeper against turn ing movement; and means carried by the other of said arms for locking the shaft against rotation, said means including a pawl pivoted to the creeper above the ratchet wheel, and a cam adapted to lock the pawl in fixed relation to the ratchet wheel.

22. In a safety operating mechanism of the character described, the combination with a rotatable shaft, subject to induced rapid rotation in one direction when free of restraint and while under load; of means for effecting rotation of said shaft in said direction until free of restraint, and there after permitting it torotate freely under load, said means including; a. member roadvance side of the bar when said'bar is rotated in said direction, being disposed farther from the center of rotation of said member than. said other opposed portion, said member,z.uljacent said portions, having additional formations thereon for automatically dis engaging the end of the bar from the socket when the shaft rotates in said direction at a speed greater than that at which the bar is actuated to rotate said shaft.

23. In a safety operating mechanism for closing and opening doors, and including a shaft rotatable in one direction for closing the door and in the opposite direction for opening the door, said shaft being subject to door locking mechanism, the combination of a rotatable and" over-running when the door is opened; means rotatable in unison with the shaft for effecting rotation thereof in both directions, said means being provided with two sets of sockets adapted for the reception of the end of an actuating bar, each of said sockets being so formed that the bar may be retained therein posed with respect to the other set of sockets. 0

In witness that I claim the foregoing I hax e hereunto subscribed my name this 3rd day of September 19 27. BER-T E. ZIMMER. 

